Hot-Spot Mix and Compressed Ablator \textit{$\rho $R} Measurements in Ignition-Scale Implosions

ORAL

Abstract

Cu and Ge dopants placed at different radial locations in the plastic ablator of indirect-drive cryogenic DT implosions are used to study the origin of hot-spot mix via He$_{\alpha }$ + satellite emission spectroscopy, and to probe the compressed ablator \textit{$\rho $R} using K-edge absorption spectroscopy. Hot-spot mix is dominated by the ablation front instability. Low neutron yields correlate with hot-spot mix mass in excess of 75 ng. Hydrodynamic simulations of the implosion are consistent with the measured compressed ablator \textit{$\rho $R} of 0.35 to 0.5 g/cm$^{2}$. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-08NA28302.

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Authors

  • S. Regan

    • Laboratory for Laser Energetics, University of Rochester
    • Univeristy of Rochester- LLE
    • Laboratory for Laser Energetics, U. of Rochester
    • University of Rochester

  • R. Epstein

    • Laboratory for Laser Energetics, U. of Rochester

  • D.D. Meyerhofer

    • Laboratory for Laser Energetics, U. of Rochester

  • T.C. Sangster

    • Laboratory for Laser Energetics, U. of Rochester

  • B.A. Hammel

    • LLNL

  • L.J. Suter

    • LLNL

  • J. Ralph

    • LLNL

  • H. Scott

    • LLNL

  • M.A. Barrios

    • LLNL

  • D.K. Bradley

    • LLNL

  • C. Cerjan

    • LLNL

  • T. Doppner

    • LLNL

  • S.H. Glenzer

    • LLNL

  • S.W. Haan

    • LLNL

  • O. Jones

    • LLNL

  • O.L. Landen

    • LLNL

  • H.S. Park

    • LLNL

  • B.A. Remington

    • LLNL

  • V.A. Smalyuk

    • LLNL

  • P. Springer

    • LLNL

  • J.D. Kilkenny

    • LLNL and General Atomics

  • I.E. Golovkin

    • Prism Computational Sciences

  • J.J. MacFarlane

    • Prism Computational Sciences

  • J.L. Kline

    • LANL

  • R.C. Mancini

    • U. of Nevada, Reno